Granted Patent
Utility
US 5,117,401 · App. 07/568,289
Active adaptive noise canceller without training mode
Inventor:
Paul L. Feintuch
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Aug 16, 1990
Inventor
Paul L. Feintuch
Assignee (at issue)
Hughes Aircraft Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.